For one reason:
So there is only one known way to counter this technique, and you cannot do it if you aren't right next to the caster to either destroy his body(the jutsu would still be in effect in this case), or trap the caster's soul inside a barrier.
If the caster has help from his team mates who are possibly guarding his position then there is no conceivable way to stop this technique. It can kill any one! No matter their strength. Even an intangible Kamui wielding Obito, since the attack is not tangible or visible.
Possibly the strongest jutsu ever?
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The following info is from Naruto wiki:
This technique allows the user's spirit to materialise and leave his body, which is then able to take possession of a target, enabling them to freely manipulate the victim's body at will. Dan Katō noted that this technique had been used to kill a great number of shinobi during his lifetime. The only known way to counteract the technique is to trap the user within a barrier, such as the Four Violet Flames Battle Encampment, before they can activate it.
With the release of the Summoning: Impure World Reincarnation technique, a reincarnated Dan was capable of taking control of his ascending spirit for a short period of time using this technique. It crossed a vast distance and was still able to manipulate a person's body as well as transfer chakra to them.
This technique allows the user's spirit to materialise and leave his body, which is then able to take possession of a target, enabling them to freely manipulate the victim's body at will. Dan Katō noted that this technique had been used to kill a great number of shinobi during his lifetime. The only known way to counteract the technique is to trap the user within a barrier, such as the Four Violet Flames Battle Encampment, before they can activate it.
With the release of the Summoning: Impure World Reincarnation technique, a reincarnated Dan was capable of taking control of his ascending spirit for a short period of time using this technique. It crossed a vast distance and was still able to manipulate a person's body as well as transfer chakra to them.
So there is only one known way to counter this technique, and you cannot do it if you aren't right next to the caster to either destroy his body(the jutsu would still be in effect in this case), or trap the caster's soul inside a barrier.
If the caster has help from his team mates who are possibly guarding his position then there is no conceivable way to stop this technique. It can kill any one! No matter their strength. Even an intangible Kamui wielding Obito, since the attack is not tangible or visible.
Possibly the strongest jutsu ever?